This may sound offensive to some here, but when I screw up an edge completely and feel I need to essentially start from scratch, I have resorted to using a Chef's Choice electric sharpener to give me a new starting point. This has only happened a couple times after getting so frustrated. Happened with a Condor Bushlore a couple years ago, and I am back to sharpening by hand again.
I don't recommend this approach, but it is what I have done in the past.